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From the iron ships a move was made to steel vessels,
which proved to be equally as strong and hy no means as
heavy or as thick as the iron type.

In dealing with the different types of steamers, there is
the single decker, or sometimes known as self trimming
steamer, which is constructed with one-depth holds only,
division being made by bulkheads throughout the length

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	Uackin&y and Bunkers
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of the ship. This type of vessel, two examples of which are
illustrated at page 79, is very useful in trades for the
carriage of bulk cargoes.

The 'tween deck steamer or two decker provides more
under-deck space for cargo and has an additional deck
built under the main deck. This type of vessel, a sketch
of which is shown above (No. 5), is used for cargoes of
a heavyweight nature, or for cargoes of small cube.

Tween decks may be divided into upper and lower
'tween decks as shown in the sketch No. 4.

In shelter deck steamers we have an additional deck
superimposed upon the main deck of the vessel, as may be